Reserves, Resources and Exploration

Committed to exploring the full extent of the mineral endowment at Savannah

We believe in the continued development and expansion of our in-ground resources to ensure a long-term sustainable business. Our ongoing exploration program is targeting increases to the Savannah North Mineral Resource and Ore Reserve and new discoveries from our regional targets.

The discovery of Savannah followed by the Savannah North find several decades later in 2015 highlights the prospectivity of the Company’s tenement holding in the East Kimberley.

The Savannah deposits are sulphide-rich nickel, copper and cobalt orebodies hosted by the layered mafic- ultramafic Savannah intrusion which is enveloped by aluminous metasediments and para-gneisses of the Tickalara Metamorphics.

The Savannah Orebody is mostly confined to a marginal norite unit up to 40 metres thick developed above the base of the intrusion. Areas of massive, matrix and disseminated sulphide mineralisation, dominated by pyrrhotite, chalcopyrite, pentlandite and minor pyrite occur throughout the marginal norite unit.

The latest Mineral Resource and Ore Reserve for Savannah can be found here.

Savannah North exploration upside

At Savannah, a significant Inferred Resource sits adjacent to the Ore Reserve and proximate to planned underground workings. This provides significant opportunity to not only extend resources, but also convert areas of the Mineral Resource outside the Ore Reserve and extend the Savannah Mine Plan.

As we ramp up our underground mining operations we’re developing more optimal underground drilling positions which allowing more effective testing of targets close to workings and known mineralisation. Our three highest priority underground drill targets at Savannah North and Savannah are:

  • T1 (Savannah above the 900 fault)
  • T2 (Savannah below the 900 fault)
  • T3 (Savannah North Eastern extensions)

Drilling has been successful in extending mineralisation close to existing workings beyond the original Mine Plan for Savannah. We will continue to seek to bring more material into our Mine Plan and enhance our operation.

For the latest updates on our exploration results and targets, please refer to our ASX announcements.

Savannah
Savannah 2
Regional prospectivity

Regional prospectivity

The Savannah tenement package spans an area of XXkm2 and

A package of 11 exploration targets have been identified within our project tenement boundary providing valuable exploration upside proximate to existing operations.

Following regional prospectivity assessments, involving diamond drilling, down-hole electromagnetic (EM) survey and surface electromagnetic survey, the Company has identified priority regional targets for further exploration activities.

Regional targets include:

Stoney Creek

The Stoney Creek intrusion located immediately north of Subchamber D was only recognised as a discrete intrusion when Company geologists mapped the area in 2018/19. Apart from a small outcropping area of ultramafic located on its eastern contact, the intrusion is composed mostly of non- cumulate gabbro-gabbronorite rock types. EM soundings and fixed loop electromagnetic (FLEM) surveys completed over the intrusion have identified a strong, discrete anomaly at depth within the intrusion. This Stoney Creek anomaly is considered to be a high-priority exploration target for follow-up in FY22.

Northern Ultramafic Granulite

Located along the trend of the Savannah and Savannah North deposits to the northwest, a previous drill hole tested an historical EM anomaly proximal to the Northern Ultramafic Granulite. Apart from minor iron-rich sulphides intersected at a depth of 440 metres, no evidence for the source of the historic EM anomaly was apparent at the target depth of 550 metres. The drill hole was terminated in Tickalara Metamorphics at a depth of 628 metres. A subsequent DHEM survey of the hole identified a highly conductive source below and to the right of the drill hole. When jointly interpreted with the historic EM data, the DHEM data indicated that hole (SMD189) passed subparallel to a series of bedrock conductor(s) located between 300 metres and 500 metres down hole. The conductors are modelled to be located to the right of the hole, starting above and migrating below the hole at depth. The conductors identified by the DHEM survey are considered to be a high-priority exploration target for follow-up in FY22.

Norton

Norton was previously identified as an area warranting prospectivity assessment, though was unable to be completed in FY21 due to heritage access, and will now be followed up in FY22.

For our most recent exploration-related news, please see our ASX announcements page.